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WO2019024211A1 - Système de projection - Google Patents

Système de projection Download PDF

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Publication number
WO2019024211A1
WO2019024211A1 PCT/CN2017/103656 CN2017103656W WO2019024211A1 WO 2019024211 A1 WO2019024211 A1 WO 2019024211A1 CN 2017103656 W CN2017103656 W CN 2017103656W WO 2019024211 A1 WO2019024211 A1 WO 2019024211A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
image
primary color
homogenizing
modulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/103656
Other languages
English (en)
Chinese (zh)
Inventor
陈红运
张宝英
郭祖强
李屹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Appotronics Corp Ltd
Original Assignee
Appotronics Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
Publication of WO2019024211A1 publication Critical patent/WO2019024211A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projection system.
  • Projection systems are widely used in theaters, education, television, etc.
  • Projection systems can be classified into DMDs according to the type of optical modulators they use (Digital Micromirror) Device), LCOS (Liquid Crystal on Silicon), LCD (Liquid Crystal Display, etc., can be divided into single-chip, two-piece and three-piece systems according to the number of light modulators.
  • the light intensity of the light emitted by the light source of the current projection system generally remains unchanged.
  • the projection system modulates the light source with a light modulator to produce image light as well as non-image light and project the image light to obtain an image to be displayed.
  • the loss of non-image light results in lower utilization of light energy.
  • the present invention provides a projection system capable of recovering non-image light, which can realize recycling of non-image light to improve light utilization efficiency.
  • Embodiments of the present invention provide a projection system, where the projection system includes:
  • a light source device comprising: a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color;
  • a homogenizing system for homogenizing and emitting the first primary color light, the second primary color light, and the third primary color light
  • a light modulation system for modulating the uniformized light emitted from the light homogenizing system according to image data of an image to be displayed, and forming image light for displaying an image and non-image light not for displaying an image;
  • a light recovery system for guiding the non-image light to the homogenizing system, and the non-image light is homogenized and emitted through the homogenizing system.
  • the projection system further includes a control device, configured to control, according to the image data, a luminous flux of the non-image light emitted from the light modulation system to the homogenizing system, according to the The light flux of the non-image light is used to adjust the light intensity of the primary color light emitted by the light source device, such that the light flux of the primary color light emitted by the light source device reaches the light homogenizing system and the luminous flux of the non-image light reaching the homogenizing system The sum of the sum remains roughly the same.
  • the image data of the image to be displayed includes image data of three primary colors
  • the light modulation system is configured to modulate first primary color light emitted from the homogenizing system according to subframe image data of a first primary color in a frame modulation period to generate image light and non-image light of a first primary color, according to The sub-frame image data of the two primary colors modulate the second primary color light emitted from the homogenizing system to generate image light and non-image light of the second primary color, and the sub-frame image data according to the third primary color is modulated from the homogenizing system The emitted third primary color light is used to generate image light and non-image light of the third primary color.
  • the light modulation system includes a first light modulator, a second light modulator, and a third light modulator, the first light modulator for sub-frames according to the first primary color in a frame modulation period
  • the image data modulates a first primary color light emitted from the homogenizing system
  • the second optical modulator is configured to modulate emission from the homogenizing system according to the sub-frame image data of the second primary color in a frame modulation period a second primary color light
  • the third optical modulator is configured to modulate a third primary color light emitted from the homogenizing system according to the subframe image data of the third primary color in a frame modulation period.
  • control device is further configured to generate a light source control signal and a modulation control signal, where the light source control signal is used to control timings of the first light source, the second light source, and the third light source to emit light;
  • the light modulation system includes a light modulator, and the modulation control signal is configured to control the light modulator to emit time from the uniform light system according to sub-frame image data of a corresponding primary color in a frame modulation period. a primary color light, a second primary color light, and a third primary color light.
  • the modulation control signal is specifically configured to control the light modulator to modulate the first primary color light emitted from the light homogenizing system according to the subframe image data of the first primary color in a first period of a frame modulation period. And modulating, according to the second frame color of the second primary color, the second primary color light emitted from the light homogenizing system according to the second time period of the one-frame modulation period, and the third time period according to the third time period of one frame modulation period The sub-frame image data of the primary color modulates the third primary color light emitted from the homogenizing system.
  • the light recovery system includes three light recovery modules, and the three light recovery modules are in one-to-one correspondence with the first light modulator, the second light modulator, and the third light modulator, and the light is recovered.
  • a module is operative to direct non-image light produced by the corresponding modulation of the light modulator to the homogenizing system.
  • the light recycling system includes a light recycling module for directing non-image light generated by the light modulator modulation to the light homogenizing system.
  • the light recycling module includes a mirror group composed of a plurality of mirrors for converting the non-image light into incidence and incidence before being incident on a light incident surface of the light homogenizing system Light that is parallel to the primary color of the homogenizing system; or
  • the mirror group is configured to control an incident angle of the non-image light on a light incident surface of the light homogenizing system such that the non-image light and primary color light incident on the light homogenizing system are in the light homogenizing system
  • the incident angle of the light incident surface is continuously distributed.
  • the image light is light having a first polarization state
  • the non-image light is light having a second polarization state
  • the first polarization state and the second polarization state are two polarization directions different a polarization state
  • the primary color light incident on the light modulator is light in a third polarization state, the third polarization state being the same as the first polarization state or the second polarization state;
  • the light modulator is a transmissive liquid crystal light valve comprising a liquid crystal layer for adjusting a polarization state of light incident on the light modulator, and opposite incident and exit surfaces, light incident on the light modulator Incident along a direction perpendicular to an incident surface of the light modulator, the image light and the non-image light being modulated by the light modulator; the image light and the non-image light being modulated from the light
  • the exit surface of the device exits in the same direction.
  • the projection system further includes a light guiding device including a polarization beam splitting element for transmitting light of a polarization state of one of the first polarization state and the second polarization state, and reflecting The light of another polarization state; the polarization beam splitting element directs the image light and the non-image light emitted by the light modulator to different directions.
  • a light guiding device including a polarization beam splitting element for transmitting light of a polarization state of one of the first polarization state and the second polarization state, and reflecting The light of another polarization state; the polarization beam splitting element directs the image light and the non-image light emitted by the light modulator to different directions.
  • the light modulator is a digital micromirror device comprising a plurality of micromirror units, and the micromirror unit of the digital micromirror device in an open state reflects at least part of light incident on the digital micromirror device
  • the image light, the micromirror unit of the digital micromirror device in an off state reflects at least part of the light incident on the digital micromirror device to form the non-image light, the image light and the non-image light Exiting from the digital micromirror device in different directions.
  • the projection system further includes a light guiding device, the light guiding device including a light combining device, the light combining device for using the first light modulator, the second light modulator, and the third light modulator
  • the image produced by the modulation is combined into a beam of light and then emitted.
  • the projection system further includes a light guiding device, the light guiding device includes a light combining device, and the light combining device is configured to guide the light emitted by the first light source, the second light source and the third light source to the The homogenizing system.
  • the light combining device includes a first light combining element and a second light combining element, wherein the first light combining element is configured to use two of the first light source, the second light source, and the third light source The emitted light is directed to the first optical path to be incident on the second light combining element along the first optical path; the second light combining element is configured to use the first light source, the second light source, and the third light source The light emitted by the other of the light sources and the light incident from the first optical path are directed to the second optical path such that they are incident on the homogenizing system along the second optical path.
  • the light homogenizing system includes at least a light homogenizing device, and the light homogenizing device includes a light incident surface for receiving the first primary color light, the second primary color light, the third primary color light, and the non-image light, And homogenize it to homogenize it.
  • the light homogenizing system includes three of the light homogenizing devices, and the three light homogenizing devices are in one-to-one correspondence with the first light source, the second light source, and the third light source, and the light homogenizing device is configured to receive The primary light emitted by the corresponding light source and the non-image light of the corresponding primary color, and the received light is homogenized.
  • the invention uses the light recovery system to redirect the non-image light emitted by the light modulation system to the light incident surface of the homogenizing system, and homogenizes it with the primary color light emitted by the light source, and then enters the light modulation system again, effectively
  • the realization of non-image light recycling, improved light utilization, and improved brightness and contrast of the displayed image is a very important property of the light modulation system.
  • Figure 1 is a block diagram showing the structure of a projection system of the present invention.
  • FIG. 2 is a schematic structural view of a projection system according to a first embodiment of the present invention.
  • FIG 3 is a schematic structural view of a projection system according to a second embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a projection system according to a third embodiment of the present invention.
  • Fig. 5 is a schematic structural view of a projection system according to a fourth embodiment of the present invention.
  • Fig. 6 is a schematic structural view of a projection system according to a fifth embodiment of the present invention.
  • Fig. 7 is a schematic structural view of a projection system according to a sixth embodiment of the present invention.
  • Figure 8 is a flow chart showing a projection method of the present invention.
  • Projection system 10 100, 200, 300, 400, 500, 600 Control device 11, 110, 210, 311, 411, 511, 611
  • Light source device 12 First light source 101R, 201R, 301R, 401R, 501R, 601R Second light source 101G, 201G, 301G, 401G, 501G, 601G Third light source 101B, 201B, 301B, 401B, 501B, 601B Homogenizing system 13 Homogenizer 102, 202, 305, 405, 505, 605 Relay lens 103, 203, 306, 404, 406, 504, 506, 604, 606
  • Light modulation system 14 First light modulator 104R, 205R Second light modulator 104G, 205G Third light modulator 104B, 205B
  • Light recovery system 16 Reflector 106, 204, 206, 309, 407, 409
  • FIG. 1 is a block diagram of a projection system 10 of the present invention.
  • the projection system 10 includes a light source device 12, a homogenizing system 13, a light modulation system 14, a light recovery system 16, and a projection lens 18.
  • the light emitted by the light source device 12 is homogenized by the homogenizing system 13 and then emitted.
  • the light modulation system 14 is configured to modulate the uniformized light emitted from the light homogenizing system 13 in accordance with image data of an image to be displayed, and form image light for displaying an image and non-image light not for displaying an image.
  • the image light enters a subsequent optical path, such as a projection lens 18 or the like.
  • the projection lens 18 is disposed on an outgoing light path of the image light for projecting the image light to a predetermined area, thereby generating the image to be displayed.
  • the light recovery system 16 is configured to direct the non-image light to the light homogenizing system 13 to homogenize the non-image light and output through the light homogenizing system 13 and emit the same with the light source device 12
  • the new light enters the light modulation system 14 again and is modulated again.
  • the non-image light is distributed to the output channel of the image light in a proportional manner according to the image data, thereby enhancing the brightness of the image light.
  • the light source device 12 includes a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color.
  • the homogenizing system 13 is configured to homogenize and emit the first primary color light, the second primary color light, and the third primary color light.
  • the projection system 10 further includes a control device 11 for controlling the non-image light emitted from the light modulation system 14 to reach the light homogenizing system 13 according to the image data.
  • a control device 11 for controlling the non-image light emitted from the light modulation system 14 to reach the light homogenizing system 13 according to the image data.
  • Light flux, and adjusting the light intensity of the primary color light emitted by the light source device 12 according to the luminous flux of the non-image light so that the primary light emitted by the light source device 12 reaches the light flux of the homogenizing system 13 and the non-
  • the sum of the luminous flux of the image light reaching the homogenizing system 13 remains substantially unchanged.
  • the image data of the image to be displayed includes image data of three primary colors.
  • the light modulation system 14 is configured to modulate the first primary color light emitted from the homogenizing system 13 according to the subframe image data of the first primary color in a frame modulation period to generate image light and non-image light of the first primary color, Modulating the second primary color light emitted from the homogenizing system 13 according to the sub-frame image data of the second primary color to generate image light and non-image light of the second primary color, and modulating the sub-frame image data according to the third primary color from the
  • the third primary color light emitted by the homogenizing system 13 produces image light of a third primary color and non-image light.
  • light modulators are mainly divided into two categories, one is a light modulator represented by DMD (digital micromirror device) that does not limit the polarization state of incident light, and the other is LCD (liquid crystal light valve).
  • LCD liquid crystal light valve
  • LCOS Reflective Liquid Crystal Light Valve
  • the technical solution corresponding to the digital micromirror device reflects the image light and the non-image light in different directions by utilizing different characteristics of the open state of the micromirror and the deflecting direction of the off state, respectively, and then the optical recovery system 16
  • the non-image light is guided to the light incident surface of the homogenizing system 13, thereby realizing the recycling of non-image light.
  • the technical solutions corresponding to the liquid crystal light valve and the reflective liquid crystal light valve utilize the polarization characteristics of light to separate the image light and the non-image light emitted from the light modulation system 14 into two different polarization states, and utilize the light guiding device. Directing the image light and the non-image light to different directions, and redirecting the non-image light therein to the incident end of the homogenizing system 13 has a distinct advantage over other solutions - the polarization state can be easily utilized The image light is distinguished from the non-image light (eg, using a polarizing beam splitter).
  • the deflection angle of the micromirror is only ⁇ 12°, that is, the image light corresponding to the open state and the non-image light corresponding to the off state have an angle of at most 24°, which is difficult to be short. Separate the distance of the propagation. Therefore, with respect to the solution represented by the digital micromirror device of the present invention, the technical solution utilizing the different characteristics of the polarization states of the image light and the non-image light is more practical and suitable for more application environments.
  • the light source referred to in the present invention includes a case where the light source is a separate light-emitting element (such as a semiconductor light-emitting element, a semiconductor light-emitting element array, a bulb light source, etc.), and a light-emitting module in which the light source is a combination of the light-emitting element and other optical elements.
  • a light-emitting module in which a light-emitting element is combined with a lens a light-emitting module of a light-emitting element and a polarization conversion element.
  • the light source of the present invention can be viewed as a "black box" that emits primary light, and any type of optical element can be included in the "black box.”
  • the image light referred to in the present invention refers to light corresponding to a display image of the projection system, and corresponds to light entering the display screen in a general projection system; non-image light refers to light used for recycling in the present invention, which is equivalent to a general Light that is filtered out of the projection system and does not enter the display screen.
  • FIG. 2 is a schematic structural diagram of a projection system 100 according to a first embodiment of the present invention.
  • the projection system 100 includes a control device 110, a light source device, a light homogenizing system, a light modulation system, a light recovery system, and a light guiding device.
  • the light source device comprises a first light source 101R for emitting first primary light (for example, a red laser), a second light source 101G for emitting a second primary light (for example, a green laser), and for emitting a third primary light.
  • a third light source 101B (for example, a blue laser).
  • the first light source 101R, the second light source 101G, and the third light source 101B are all laser light sources, such as a laser diode light source, a laser diode array light source, or a laser light source.
  • the light source has a small amount of optical expansion such that the light it emits has a smaller spot and a smaller angle of light divergence when entering the homogenizing system, and maintains the light as it enters the light modulation system through a series of optical elements.
  • the small amount of optical expansion prevents a large amount of light from being used due to the large divergence angle, which improves the light utilization efficiency. If other light sources, such as bulb light source and LED light source, are used, the optical expansion is much larger than the optical expansion of the laser source.
  • the divergence angle of the light will be enlarged.
  • a large amount of light is rendered unusable by the light modulation system and absorbed and converted into heat outside the effective optical surface of the light modulation system.
  • the light emitted by the light source is combined with the non-image light to form a beam of light by geometrically combining light, thereby increasing the cross-sectional area of the homogenizing system, so that the optical expansion amount is expanded if optical is used.
  • a light source with a large amount of expansion will further reduce the light utilization rate.
  • the first embodiment uses a small optical expansion amount of the laser light source, even if the recycled non-image light is combined with the light emitted by the light source, the light incident on the light modulation system can be ensured to have a small optical expansion. .
  • a light bulb or an LED light source can also be used as a light source of the projection system.
  • a light source Even with such a light source, it is possible to have higher light utilization efficiency than the technical solution not using the present invention.
  • the light homogenizing system includes at least a light homogenizing device 102, and the light homogenizing device 102 includes a light incident surface for receiving the first primary color light, the second primary color light, the third primary color light, and the non-image light, and It is homogenized and homogenized to enter the light modulation system in accordance with a spot of a predetermined shape.
  • the dodging system includes three of the light homogenizing devices 102, and the three light homogenizing devices 102 are combined with the first light source 101R, the second light source 101G, and the third light source 101B.
  • the light homogenizing device 102 is configured to receive the primary color light emitted by the corresponding light source and the non-image light of the corresponding primary color, and to homogenize the received light.
  • the light homogenizing device 102 may select a pair of fly-eye lenses, the incident surface of the pair of fly-eye lenses includes a first region and a second region that do not overlap each other, and the primary color light emitted by the light source is from the first region. Incident is incident into the fly-eye lens pair, while non-image light is incident from the second region into the fly-eye lens pair. Since the first region and the second region do not overlap each other, the technical solution can be applied to a case where the primary light emitted by the light source has the same wavelength and the same polarization state as the non-image light. This is because the primary light and the non-image light emitted by the light source in the first embodiment have the same wavelength and the same polarization state, and cannot be combined by wavelength combining or polarized light.
  • the geometrical combination method can also be applied to the case where the polarization states of the primary and the non-image light emitted by the light source are different, and even the case where the primary light and the non-image light emitted by the light source are unpolarized, as long as It is ensured that the combined light becomes a single polarization state before it is incident on the light modulator.
  • a polarization conversion element can be disposed on the optical path between the light homogenizing device 102 and the light modulation system, and the polarization conversion element is used to convert the light emitted from the light homogenizing device 102 into an optical modulation system before being converted into Light of the third polarization state.
  • the first region and the second region are arranged side by side on the light incident surface of the light homogenizing device 102.
  • the first region and the second region may also be in accordance with other arrangements.
  • the second area is disposed around the first area, and the first area and the second area are distributed in a "back" shape such that the first area is located at the center of the light homogenizing device 102, and the distribution manner can avoid the primary color emitted by the light source.
  • the reflective sheet of the intermediate through-hole (such as a retro-reflective sheet, the middle opening is a through-hole) can be used to reflect non-image light to the second region, and at the same time, the primary light emitted by the light source can be transmitted;
  • the non-image light is split into two beams of the same wavelength and polarization state by using a transflective beam splitter, and guided to the second regions on the upper and lower sides of the first region, respectively.
  • the first area and the second area may also be arranged in a "mesh" shape such that the first area is located in the center of the second area, and the second area is divided into two parts located above and below (or left and right) of the first area.
  • the area ratio of the first region to the second region is 1:1 to 1:5.
  • the area of the first area being smaller than the area of the second area enables the projection system to have a higher light utilization efficiency. This is because the first region and the second region are in principle optically expanding the combined light.
  • the larger the area of the second region the smaller the divergence angle corresponding to the non-image light, and the smaller the area of the second region.
  • the divergence angle corresponding to the non-image light is larger, and the light having an excessive divergence angle cannot be utilized. Therefore, the proportion of the second region determines the efficiency of light recycling.
  • the volume of the light homogenizing device 102 cannot be too large, so the size of the first region also satisfies the optical expansion requirement of the light emitted by the light source, and the first region cannot be infinitely reduced, otherwise the light source emits The divergence angle of the primary light also expands to reduce the utilization of the primary color light emitted by the light source.
  • the light homogenizing device 102 can also use a homogenizing rod or an integrator rod.
  • the light homogenizing system further includes at least a relay lens 103, and the relay lens 103 is disposed on an optical path between the light homogenizing device 102 and the light modulation system, and is used for The exiting light of the light homogenizing device 102 is focused, homogenized, or shaped prior to being incident on the light modulation system.
  • the technical solution protected by the present invention is not limited to the number or kind of relay lenses in the first embodiment, and the relay lens 103 may be a convex lens or a concave lens.
  • the light modulation system includes a first light modulator 104R, a second light modulator 104G, and a third light modulator 104B, the first light modulator 104R being configured to be based on the first primary color within a frame modulation period
  • the sub-frame image data modulates the first primary color light emitted from the homogenizing system
  • the second optical modulator 104G is configured to modulate the sub-frame image data according to the second primary color from the uniformity in a frame modulation period.
  • a second primary color light emitted by the optical system the third optical modulator 104B configured to modulate the third primary color light emitted from the homogenizing system according to the subframe image data of the third primary color in a frame modulation period.
  • the first light modulator 104R, the second light modulator 104G, and the third light modulator 104B are respectively transmissive liquid crystal light valves, including for adjusting incidence to the light modulator.
  • the liquid crystal layer of the polarization state of the light, and the opposite incident and exit surfaces, the light incident on the light modulator is incident in a direction perpendicular to the incident surface of the light modulator, modulated by the light modulator
  • the image light and the non-image light are generated.
  • the image light and the non-image light are emitted in the same direction from an exit surface of the light modulator.
  • the image light is light having a first polarization state (such as P light, but is not limited thereto), and the non-image light is light having a second polarization state (such as S light,
  • the first polarization state and the second polarization state are two polarization states different in polarization direction.
  • the image light and the non-image light emitted by the light modulator are respectively guided to different directions.
  • the polarization states of the image light and the non-image light are different, so that the two are easy to split, more practical, and suitable for more application environments.
  • the primary color light incident on the light modulator is light of a third polarization state in a single polarization state. Since the light modulator acts on the polarization state of the incident light, if the light incident on the light modulator has a plurality of polarization states, it is impossible to distinguish the image light as an image component from the polarization state of the emitted light.
  • the technical solution avoids the additional addition of other polarization conversion devices, so that the light and non-image light emitted by the light source device can be directly utilized by the light modulator after being homogenized by the homogenizing system, simplifying the structure.
  • the third polarization state is the same as the second polarization state, that is, the light whose polarization state is changed becomes the image light of the first polarization state, and the light of the remaining portion that does not change the polarization state becomes Non-image light of the second polarization state.
  • the modulation method can be implemented by changing the voltage applied to the light modulators 104R, 104G, and 104B to change the alignment direction of the liquid crystal molecules in the liquid crystal layer.
  • the operation principle of the LCD can be referred to, and details are not described herein again.
  • the third polarization state may also be the same as the first polarization state, that is, the light of the changed polarization state is used as the non-image light of the second polarization state, and the light of the polarization state is not changed as the image.
  • This technical solution can be realized by converting an image signal into an inverted image signal and inputting it to the light modulator on the basis of the first embodiment; also by light modulation on the basis of the first embodiment It is also possible to add a half wave plate to the device; it can also be realized by using other kinds of transmissive liquid crystal light valves, which will not be described in detail here.
  • the third polarization state may also be different from the first polarization state and the second polarization state, for example, the third polarization state is elliptically polarized light.
  • the light guiding device includes a polarization beam splitting element 105 for transmitting light of a polarization state of one of a first polarization state and a second polarization state, and reflecting the other Polarized light.
  • the polarization beam splitting element 105 directs the image light and the non-image light emitted from the light modulator to different directions.
  • the light guiding device further includes a light combining device 107 disposed on an outgoing light path of the light modulation system for using the first light modulator 104R, the second light modulator 104G, and the first
  • the image light produced by the three-light modulator 104B is combined into a beam of light and then emitted, for example, to the projection lens 108.
  • the light recovery system includes three light recovery modules, three of the light recovery modules and the first light modulator 104R, the second light modulator 104G, and the third light modulator.
  • the light recycling module is configured to guide non-image light generated by the corresponding light modulator modulation to the light homogenizing system.
  • each of the light recycling modules includes a mirror group composed of a plurality of mirrors 106 for injecting the non-image light into the light homogenizing system
  • the light incident surface is converted into light parallel to the primary color light incident on the homogenizing system.
  • the mirror group is configured to control an incident angle of the non-image light on a light incident surface of the light homogenizing system, so that the non-image light and the primary color light incident on the light homogenizing system are in the uniformity
  • the incident angle distribution of the light incident surface of the optical system is continuous.
  • the mirror 106 can be a planar mirror or a curved mirror.
  • FIG. 3 is a schematic structural diagram of a projection system 200 according to a second embodiment of the present invention.
  • the main difference between the projection system 200 of the second embodiment and the projection system 100 of the first embodiment is that the first light modulator 205R, the second light modulator 205G, and the third light modulator 205B in the second embodiment are respectively a digital micromirror device comprising a plurality of micromirror units, the micromirror unit of the digital micromirror device being in an open state reflecting at least a portion of the light incident on the digital micromirror device to form the image Light, the micromirror unit of the digital micromirror device in an off state reflects at least a portion of the light incident on the digital micromirror device to form the non-image light, the image light and the non-image light from the The digital micromirror device emits in different directions.
  • the digital micromirror device reflects the image light and the non-image light in different directions by utilizing different characteristics of the open state of the micromirror and the deflecting direction of the off state, and therefore, it is not required to be used in the second embodiment.
  • the polarization beam splitting element directs the image light and the non-image light emitted from the light modulator to different directions.
  • FIG. 4 is a schematic structural diagram of a projection system 300 according to a third embodiment of the present invention.
  • the main difference between the projection system 300 of the third embodiment and the projection system 100 of the first embodiment is that the light-emitting method of the light source device and the light combining mode of the three primary colors are different, so that the uniform light system, the light modulation system, and the corresponding The structure of the light recovery system also varies in number.
  • the light combining device is disposed on an optical path between the light source device and the light homogenizing system, and the light combining device is configured to use the first light source 301R, the second light source 301G, and the third light source Light emitted by 301B is directed to the homogenizing system.
  • the light combining device includes a first light combining element 302 and a second light combining element 303, and the first light combining element 302 is configured to use the first light source 301R and the second light source.
  • Light emitted by two of the 301G and third light sources 301B is directed to the first optical path such that it is incident on the second light combining element 303 along the first optical path.
  • the second light combining element 303 is configured to guide light emitted by the other of the first light source 301R, the second light source 301G, and the third light source 301B and light incident from the first light path to the second light path Having it incident on the homogenizing system along the second optical path.
  • the light emitted by two of the first light source 301R, the second light source 301G, and the third light source 301B are incident on the first light combining element 302 from different directions, the first light source 301R, Light emitted from the other of the two light sources 301G and 301B and light incident from the first light path are incident on the second light combining element 303 from different directions, respectively.
  • the light guiding device further includes a relay lens 304, and the relay lens 304 is disposed on an optical path between the light combining device and the light homogenizing system for The exiting light of the light device is focused, homogenized or shaped prior to being incident on the homogenizing system.
  • the homogenizing system includes a light homogenizing device 305
  • the light modulation system includes a light modulator 307
  • the light recycling system includes a light recycling module, and the light recycling module The non-image light generated by the modulation by the light modulator 307 is directed to the light homogenizing device 305.
  • control device 311 is configured to generate a light source control signal for controlling the timing of the first light source 301R, the second light source 301G, and the third light source 301B to emit light, and a modulation control signal. .
  • the modulation control signal is used to control the light modulator 307 to time-modulate the first primary color light, the second primary color light, and the first light emitted from the uniform light system according to the sub-frame image data of the corresponding primary color in a frame modulation period.
  • Three primary colors of light are used to control the light modulator 307 to time-modulate the first primary color light, the second primary color light, and the first light emitted from the uniform light system according to the sub-frame image data of the corresponding primary color in a frame modulation period.
  • the modulation control signal is configured to control the optical modulator to modulate the first primary color light emitted from the homogenizing system according to the subframe image data of the first primary color in a first period of a frame modulation period, Modulating a second primary color light emitted from the homogenizing system according to the subframe image data of the second primary color in a second period of one frame modulation period, and according to the third primary color in a third period of a frame modulation period
  • the sub-frame image data modulates the third primary color light emitted from the homogenizing system.
  • FIG. 5 is a schematic structural diagram of a projection system 400 according to a fourth embodiment of the present invention.
  • the main difference between the projection system 400 of the fourth embodiment and the projection system 300 of the third embodiment is that the light modulator 408 in the fourth embodiment is a digital micromirror device, and the digital micromirror device includes a plurality of micromirror units.
  • the micromirror unit of the digital micromirror device in an open state reflects at least part of the light incident on the digital micromirror device to form the image light, and the micromirror unit of the digital micromirror device in an off state will Light reflected at least partially into the digital micromirror device forms the non-image light, the image light and the non-image light emerging from the digital micromirror device in different directions.
  • the digital micromirror device reflects the image light and the non-image light in different directions by utilizing the characteristics of the open state of the micromirror and the deflecting direction of the off state, respectively, and therefore, it is not required to be used in the fourth embodiment.
  • the polarization beam splitting element directs the image light and the non-image light emitted by the light modulator 408 to different directions.
  • FIG. 6 is a schematic structural diagram of a projection system 500 according to a fifth embodiment of the present invention.
  • the main difference between the projection system 500 of the fifth embodiment and the projection system 300 of the third embodiment is the difference of the light combining device.
  • the light combining device includes a light combining element, a first light source 501R, and a second light source 501G. Light emitted from the third light source 501B is incident to the light combining element from different directions, respectively.
  • FIG. 7 is a schematic structural diagram of a projection system 600 according to a sixth embodiment of the present invention.
  • the main difference between the projection system 600 of the sixth embodiment and the projection system 400 of the fourth embodiment is the difference of the light combining device.
  • the light combining device includes a light combining element, the first light source 601R and the second light source 601G. Light emitted from the third light source 601B is incident to the light combining element from different directions, respectively.
  • the projection system may be any device that projects or displays a monochrome or multi-color image such as a television device, a projector device, a wall-mounting device, a stage computer lamp device, an image projector device, or the like.
  • the present invention re-allocates non-image-modulated light into a display image corresponding to image light, the brightness of the display image of the present invention is improved as compared with the aspect in which the present invention is not employed.
  • the invention uses the light recovery system to redirect the non-image light emitted by the light modulation system to the light incident surface of the homogenizing system, and homogenizes it with the primary color light emitted by the light source, and then enters the light modulation system again, effectively The realization of non-image light recycling, improved light utilization, and improved brightness and contrast of the displayed image.
  • the invention utilizes the characteristics of the large optical expansion amount of the homogenizing device itself, in addition to satisfying the small optical expansion amount emitted by the light source, and leaving sufficient optical expansion margin for non-image light recycling, so that the light The recycling efficiency is greatly improved.
  • the present invention also provides a projection method applied to the above projection system 10, 100, 200, 300, 400, 500 or 600, the projection method comprising the following steps:
  • Step 801 controlling the light source device to emit the first primary color light, the second primary color light, and the third primary color light.
  • Step 802 homogenizing and emitting the first primary color light, the second primary color light, and the third primary color light by using a homogenizing system.
  • Step 803 modulating the uniformized light emitted from the homogenizing system according to the image data of the image to be displayed by using the light modulation system, and forming image light for displaying an image and non-image light not for displaying the image.
  • the image data of the image to be displayed includes image data of three primary colors.
  • the step 803 specifically includes:
  • Step 804 The non-image light is guided to the homogenizing system by using a light recovery system, and the non-image light is homogenized and emitted through the homogenizing system.
  • Step 805 projecting the image light to a predetermined area to generate the image to be displayed.
  • the projection method further includes: controlling a luminous flux of the non-image light to the homogenizing system according to the image data, and adjusting a primary color emitted by the light source device according to a luminous flux of the non-image light.
  • the light intensity of the light is such that the sum of the luminous flux of the primary color light emitted by the light source device reaching the homogenizing system and the luminous flux of the non-image light reaching the homogenizing system remains substantially unchanged.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un système de projection (10). Le système de projection (10) comprend un dispositif de source de lumière (12), un système d'homogénéisation de lumière (13), un système de modulation de lumière (14) et un système de recyclage de lumière (16). Le dispositif de source de lumière (12) est utilisé pour émettre une première lumière primaire, une deuxième lumière primaire et une troisième lumière primaire. Le système d'homogénéisation de lumière (13) effectue une homogénéisation sur la première lumière primaire, la deuxième lumière primaire et la troisième lumière primaire, et émet celles-ci. Le système de modulation de lumière (14) module, en fonction des données d'image de l'image à afficher, la lumière homogénéisée émise par le système d'homogénéisation de lumière (13), et forme une lumière d'image pour afficher l'image et une lumière de non-image pour ne pas afficher l'image. Le système de recyclage de lumière (16) guide la lumière de non-image vers le système d'homogénéisation de lumière (13), de façon à permettre à la lumière de non-image d'être homogénéisée par le système d'homogénéisation de lumière (13) et ensuite d'être émise. Le système de recyclage de lumière (16) est utilisé pour rediriger la lumière de non-image vers la surface d'incidence de lumière du système d'homogénéisation de lumière (13), de telle sorte que la lumière de non-image avec la lumière primaire émise par le dispositif de source de lumière (12) entrent, après avoir été homogénéisées par le système d'homogénéisation de lumière (13), dans le système de modulation de lumière (14) à nouveau, améliorant de manière efficace le taux d'utilisation de lumière et la luminosité et le contraste de l'image d'affichage.
PCT/CN2017/103656 2017-08-04 2017-09-27 Système de projection Ceased WO2019024211A1 (fr)

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CN112015038A (zh) * 2019-05-31 2020-12-01 深圳光峰科技股份有限公司 光源系统及应用其的投影设备
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